Process of reproducing colored original etchings.



llNrTnn nTnTns PATENT @rrrcra BERNI-IARD MANNFELD, OFFRANKFORT-ON-THE-MAIN, GERMANY.

PROCESS OF REPRODUCING COLORED ORiGlNAL ETCHINGS.

SPECIFICATION forming part of Letters Eatent No. 690,974, dated January14, 1902.

Application filed April 7, 1899. Serial No. 712,072- (No specimens.)

To ctZl whom it nu/.7 concern.-

Be it known that I, BERNHARD MANNFELD, a subject of the King ofPrussia,German Emperor, residing at Frankfort-on-the-ltlain, in theKingdom of Prussia, Germany, have invented certain new and usefulImprovements in Processes for the Reproduction of Colored OriginalEtchings, (for which I have applied for patents in England, datedJanuary 27, 1899, No. 1,911; in Austria, dated December 31,1898; inHungary, dated January 25,1899, No. 1,110; in Germany, dated February14, 1899, and in France, dated January 27, 1899, No. 273,245,) of whichthe following is a specification.

My present invention relates to improvements in the production ofcolored prints; and the objects of my improvements are to enable theartist to produce the necessary printing-plates for the different colorshimself without danger of the plates not exactly corresponding whenprinting and to free him from mechanical restrictions.

In carrying out my invention I engrave a plate in the usual manner-thatis, I make the drawing on a copper plate covered by a thin coating ofwax and etch the. same with some suitable acid. I then take a few printsof the plate and, if necessary, retouch the former until it is found tobe quite correct, whereupon I make impressions of this plate one numberof stones or on other metal plates, the number of which depends on thenumber of colors used. I etch these stones or metal plates, aftercovering the parts that have not to be acted upon with lithographic inkor Venetian chalk, according to whether the lights and shades of colorare to stand out sharply or diifusedly. The parts covered by thelithographic ink are completely protected 011 etching, while thosecovered by the porous chalk are partially protected, so that a dullersurface is produced at these parts which in printing produces acrayon-like shade. After preparing a stone or metal plate for each colorin this manner I remove the ink or chalk with turpentine and then coatthe parts uncovered with color. I now make consecutive impressions ofeach of these stones or plates on well- Inoistened paper-for example, onChinese or Japanese paper. The colors I use are those capable of beingmixed with benzole and glycerin,which are neither those known as oil norwater colors and are such as are ordinarily used by those skilled in theart. The exact nature of the colors will be clear from the followingfurther description of the process. The smearing or running of thecolors when printing does not take place, because benzole is insolublein water; but they are nevertheless not prevented from penetrating intothe pores of the paper. After printing all the colors in thismanner Iplace the print in a bath of benzin, so that the benzole, which isinvolatile, is removed,whereby the colors will be still more closelycombined with the paper. When the benzole has been removed, I remove theglycerin by dipping the print into a water-bath. A little alum is addedto the water, so as to somewhat roughen the paper again. I then placethe print while still moist into a press and impress the originalplate-that is, that on which the drawing was engraved and etched in thefirst place over the colors. The print is now finished and has only tobe mounted on cardboard or the like in the usual manner.

By removing the benzole and glycerin before impressing the originalplate on the print the drawing is reproduced with great distinctness, asthe print is only fully permeated with moisture when the benzole andglycerin have been removed.

What I claim, and desire to secure by Let ters Patent of the UnitedStates, is-

1. The process for producing colored etchings, which consists in etchingthe design as an intaglio-plate, then reproducing said design on therequisite number of stones or plates, the number corresponding to thenumber of colors used, then etching portions of the several stones orplates,as desired,to form relief-plates for printing the several colors,and subsequently printing the several colors from the correspondingrelief stones or plates upon the paper or surface to be printed, andthen after moistening the said paper or surface, printing the outlinesand shadings by the said intaglio-plate, substantially as set forth.

2. The process for producing colored etchings, which consists in etchingthe design as an intaglio-plate, then reproducing said design on therequisite number of stones or plates, the number corresponding to thenumlution of alum, and lastly printing the outber of colors used, thenetching portions of lines and shadings by the said intaglio-plate, theseveral stones or p1ates,as desired,t0 form substantially as set forth.

relief-plates for printing the several colors, In testimony whereof Ihave hereunto set 5 and subsequently printing the several colors my handin the presence of two Witnesses. 15

from the corresponding reliefstones or plates 7 upon the paper orsurface to be printed, and BERNHARD MANNFELD' then moistening theprinted sheets with ben- Witnesses: zin, drying them, and afterwardmoistening RICHARD GUENTHER, 10 the prints on the picture side With aweak so- JEAN GRUND.

